The electrons in the double bond (N=O) can move to the other N-O bond while maintaining the overall charge of the nitro group equal to 0.
The electrons in the double bond cannot be moved to the C-N bond and form a C=N because the C will have 5 bonds then and you cannot place more than 8 electrons around C since that will violate the octet rule.
Resonance structures of CH3NO2:
Draw the additional resonance structure(s) of the structure below.
• Include all valence lone pairs in your answer.
• Separate resonance structures using the symbol ↔
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